Pub Date : 2021-01-01DOI: 10.1080/21622515.2020.1869839
M. Danouche, H. El Arroussi, W. Bahafid, N. El Ghachtouli
ABSTRACT Dye effluents are among the most polluted wastewaters that require adequate treatment before their discharge into the environment. They have multiple chemical properties that allow them great resistance to environmental conditions, such as the persistence of coloured fabric against washing, exposure to light, chemicals, and biological attacks. However, these same particularities make them hardly degradable, thereby complicating their disposal using traditional methods. The use of biosorption for the removal of dye from wastewater has emerged as a simple, effective, and ecologically technique. Diverse biomaterials are known to bind such pollutants, including natural residues, agricultural wastes and various microorganisms like bacteria, fungi, microalgae, and yeast. In recent decades, the use of yeast cells has received increasing attention, due to their advantages such as low-cost price, availability, and ability to remove various recalcitrant contaminants. On the other hand, their autoaggregation properties can facilitate their recuperation after treatment. The present paper explores the state of the art in the field of biosorption of dye using living, dead, and modified yeast cells. Kinetic, equilibrium models as well as the analytical methods employed in biosorption studies are also discussed. The effects of physicochemical conditions on the biosorption efficiency, including physical, chemical, and biotechnological techniques that can be utilized to increase yeast’s biosorption capacities are also highlighted. GRAPHICAL ABSTRACT
{"title":"An overview of the biosorption mechanism for the bioremediation of synthetic dyes using yeast cells","authors":"M. Danouche, H. El Arroussi, W. Bahafid, N. El Ghachtouli","doi":"10.1080/21622515.2020.1869839","DOIUrl":"https://doi.org/10.1080/21622515.2020.1869839","url":null,"abstract":"ABSTRACT Dye effluents are among the most polluted wastewaters that require adequate treatment before their discharge into the environment. They have multiple chemical properties that allow them great resistance to environmental conditions, such as the persistence of coloured fabric against washing, exposure to light, chemicals, and biological attacks. However, these same particularities make them hardly degradable, thereby complicating their disposal using traditional methods. The use of biosorption for the removal of dye from wastewater has emerged as a simple, effective, and ecologically technique. Diverse biomaterials are known to bind such pollutants, including natural residues, agricultural wastes and various microorganisms like bacteria, fungi, microalgae, and yeast. In recent decades, the use of yeast cells has received increasing attention, due to their advantages such as low-cost price, availability, and ability to remove various recalcitrant contaminants. On the other hand, their autoaggregation properties can facilitate their recuperation after treatment. The present paper explores the state of the art in the field of biosorption of dye using living, dead, and modified yeast cells. Kinetic, equilibrium models as well as the analytical methods employed in biosorption studies are also discussed. The effects of physicochemical conditions on the biosorption efficiency, including physical, chemical, and biotechnological techniques that can be utilized to increase yeast’s biosorption capacities are also highlighted. GRAPHICAL ABSTRACT","PeriodicalId":37266,"journal":{"name":"Environmental Technology Reviews","volume":"10 1","pages":"58 - 76"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/21622515.2020.1869839","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49168331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.1080/21622515.2021.1983030
Vinay Kumar, S. Dwivedi
ABSTRACT Electroplating industries produce a large amount of wastewater laden with a high amount of heavy metals and other toxic inorganic and organic contaminants. The wastewater generated from the process is highly toxic to all forms of life. It has severe toxicity to aquatic plants, fish and other living multicellular or unicellular organisms. On land, it affects germination rates, growth and development of plants and also causes heavy metal accumulation in vegetable and grain crops. Several human health issues are also associated with electroplating wastewater (EWW) due to its content of toxic metals and organic pollutants. The treatment of EWW is therefore essential before its disposal to protect the environment and its living organisms. This review identified the hazardous content of EWW and their toxicity The reviewed focused in particular on current bioremediation strategies for the safe treatment of EWW, their major challenges and future potential application. The review highlighted that integrated biological-treatment systems, such as constructed wetland can provide a cheap, eco-friendly and sustainable alternative to conventional technologies for the treatment of EWW. GRAPHICAL ABSTRACT
{"title":"Toxicity potential of electroplating wastewater and its bioremediation approaches: a review","authors":"Vinay Kumar, S. Dwivedi","doi":"10.1080/21622515.2021.1983030","DOIUrl":"https://doi.org/10.1080/21622515.2021.1983030","url":null,"abstract":"ABSTRACT Electroplating industries produce a large amount of wastewater laden with a high amount of heavy metals and other toxic inorganic and organic contaminants. The wastewater generated from the process is highly toxic to all forms of life. It has severe toxicity to aquatic plants, fish and other living multicellular or unicellular organisms. On land, it affects germination rates, growth and development of plants and also causes heavy metal accumulation in vegetable and grain crops. Several human health issues are also associated with electroplating wastewater (EWW) due to its content of toxic metals and organic pollutants. The treatment of EWW is therefore essential before its disposal to protect the environment and its living organisms. This review identified the hazardous content of EWW and their toxicity The reviewed focused in particular on current bioremediation strategies for the safe treatment of EWW, their major challenges and future potential application. The review highlighted that integrated biological-treatment systems, such as constructed wetland can provide a cheap, eco-friendly and sustainable alternative to conventional technologies for the treatment of EWW. GRAPHICAL ABSTRACT","PeriodicalId":37266,"journal":{"name":"Environmental Technology Reviews","volume":"10 1","pages":"238 - 254"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47913455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.1080/21622515.2020.1869323
A. Al-Amin, F. Parvin, J. Chakraborty, Yong-Ick Kim
ABSTRACT Heavy metal in wastewater is a crucial concern due to its toxicological manifestations on human health, particularly in developing countries. Compared to different conventional heavy metal removal methods, cyanobacteria mediated heavy metal removal is a potential method, as it is a cost-effective, in situ operable, and green chemistry approach. They are excellent tools for multidirectional metal sequestration operations as they can simultaneously sequester metal through biosorption and bioaccumulation. Biosorption is a cell surface phenomenon, whereas bioaccumulation occurs inside the cell. This study reviewed deeply how cyanobacteria sequester heavy metal ions by these two processes from an ambient water body and the defense mechanism of cyanobacteria against metal-induced toxicity. Further, among the different components of the cyanobacteria's cell wall, this blue–green algae biosorb the metal ion mainly through Exopolysaccharide (EPS). The article discusses several pathways of EPS biosynthesis to know the potential engineering approach for producing this incredible polymer, which facilitates its metal ion adsorption property. Furthermore, we compare different cyanobacterial species’ ability to sequester heavy metals from water in different environmental conditions. Limnococcussp, Nostocmuscorum, and Synechococcus sp. PCC 7942 shows optimum efficiency based on heavy metal removal, multi-metal removal by biosorption and bioaccumulation, and contact time. Finally we for the first time, discussed the circadian clock application in the cyanobacterial metal ion sequestration process, which might disclose the molecular-level mechanisms of cyanobacteria to sequester metal ions and different defense mechanisms. GRAPHICAL ABSTRACT
{"title":"Cyanobacteria mediated heavy metal removal: a review on mechanism, biosynthesis, and removal capability","authors":"A. Al-Amin, F. Parvin, J. Chakraborty, Yong-Ick Kim","doi":"10.1080/21622515.2020.1869323","DOIUrl":"https://doi.org/10.1080/21622515.2020.1869323","url":null,"abstract":"ABSTRACT Heavy metal in wastewater is a crucial concern due to its toxicological manifestations on human health, particularly in developing countries. Compared to different conventional heavy metal removal methods, cyanobacteria mediated heavy metal removal is a potential method, as it is a cost-effective, in situ operable, and green chemistry approach. They are excellent tools for multidirectional metal sequestration operations as they can simultaneously sequester metal through biosorption and bioaccumulation. Biosorption is a cell surface phenomenon, whereas bioaccumulation occurs inside the cell. This study reviewed deeply how cyanobacteria sequester heavy metal ions by these two processes from an ambient water body and the defense mechanism of cyanobacteria against metal-induced toxicity. Further, among the different components of the cyanobacteria's cell wall, this blue–green algae biosorb the metal ion mainly through Exopolysaccharide (EPS). The article discusses several pathways of EPS biosynthesis to know the potential engineering approach for producing this incredible polymer, which facilitates its metal ion adsorption property. Furthermore, we compare different cyanobacterial species’ ability to sequester heavy metals from water in different environmental conditions. Limnococcussp, Nostocmuscorum, and Synechococcus sp. PCC 7942 shows optimum efficiency based on heavy metal removal, multi-metal removal by biosorption and bioaccumulation, and contact time. Finally we for the first time, discussed the circadian clock application in the cyanobacterial metal ion sequestration process, which might disclose the molecular-level mechanisms of cyanobacteria to sequester metal ions and different defense mechanisms. GRAPHICAL ABSTRACT","PeriodicalId":37266,"journal":{"name":"Environmental Technology Reviews","volume":"10 1","pages":"44 - 57"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/21622515.2020.1869323","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44239808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.1080/21622515.2021.1899294
L. Azevedo, T. Bressani-Ribeiro, C. A. Chernicharo, Juliana Calábria de Araújo
ABSTRACT The anaerobic technology via UASB reactors is consolidated for mainstream sewage treatment in warm climate regions (i.e. Brazil and India). The need to improve the post-treatment step in terms of nitrogen removal has driven researchers and practitioners to assess different technological alternatives. Although the anammox (anaerobic ammonium oxidation) process has been already used in full-scale applications to remove nitrogen from ammonium-rich (> 1000 mgN L−1) wastewaters (sidestream), it is still a concern for mainstream application. Several studies have been performed aiming to solve existing drawbacks related to the implementation of mainstream partial nitritation-anammox (PN/A) for N removal from sewage, however, none of them addressed the particular conditions of anaerobically treated sewage under warm climate conditions. Therefore, this paper presents a critical review of the main limiting factors commonly reported for mainstream PN/A application, focusing on possible applications of single-stage partial nitritation-anammox for post-treatment of anaerobically treated sewage under warm climate conditions. Commonly reported constraints for achieving mainstream PN/A application such as temperature, COD/N ratio, sulfide toxicity and nitrite requirements were addressed. It was concluded that temperature and COD/N should not be concerns for mainstream anammox systems fed on anaerobically treated sewage under warm climate regions. Despite long-term exposure assessments should be still performed, sulfide toxicity seems to be of less relevance. Therefore, reaching reliable nitritation is the major challenge that remains among the typically reported limitations for mainstream PN/A application following anaerobic sewage treatment. GRAPHICAL ABSTRACT
{"title":"Mainstream partial nitritation-anammox as post-treatment of anaerobic effluents under warm climate regions: a critical review of the reported drawbacks","authors":"L. Azevedo, T. Bressani-Ribeiro, C. A. Chernicharo, Juliana Calábria de Araújo","doi":"10.1080/21622515.2021.1899294","DOIUrl":"https://doi.org/10.1080/21622515.2021.1899294","url":null,"abstract":"ABSTRACT The anaerobic technology via UASB reactors is consolidated for mainstream sewage treatment in warm climate regions (i.e. Brazil and India). The need to improve the post-treatment step in terms of nitrogen removal has driven researchers and practitioners to assess different technological alternatives. Although the anammox (anaerobic ammonium oxidation) process has been already used in full-scale applications to remove nitrogen from ammonium-rich (> 1000 mgN L−1) wastewaters (sidestream), it is still a concern for mainstream application. Several studies have been performed aiming to solve existing drawbacks related to the implementation of mainstream partial nitritation-anammox (PN/A) for N removal from sewage, however, none of them addressed the particular conditions of anaerobically treated sewage under warm climate conditions. Therefore, this paper presents a critical review of the main limiting factors commonly reported for mainstream PN/A application, focusing on possible applications of single-stage partial nitritation-anammox for post-treatment of anaerobically treated sewage under warm climate conditions. Commonly reported constraints for achieving mainstream PN/A application such as temperature, COD/N ratio, sulfide toxicity and nitrite requirements were addressed. It was concluded that temperature and COD/N should not be concerns for mainstream anammox systems fed on anaerobically treated sewage under warm climate regions. Despite long-term exposure assessments should be still performed, sulfide toxicity seems to be of less relevance. Therefore, reaching reliable nitritation is the major challenge that remains among the typically reported limitations for mainstream PN/A application following anaerobic sewage treatment. GRAPHICAL ABSTRACT","PeriodicalId":37266,"journal":{"name":"Environmental Technology Reviews","volume":"10 1","pages":"143 - 160"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/21622515.2021.1899294","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42249606","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.1080/21622515.2021.1995786
A. Bagastyo, Afrah Zhafirah Sinatria, A. Anggrainy, Komala Affiyanti Affandi, Sucahyaning Wahyu Trihasti Kartika, E. Nurhayati
ABSTRACT In addition to high-purity salts, salt farms and industries generate a substantial amount of highly concentrated brine (bittern) byproducts. The presence of high salinity in this waste stream may lead to adverse environmental impacts. Environmental concerns and strict regulations on its disposal have driven the development of innovative practices for bittern management to achieve sustainable resource use and recovery. Meanwhile, commercial materials (Li, Rb, and Cs) that may be contained in the bittern can be seen as attractive value-added resources. This review article comparatively discusses the available technologies for bittern recovery, their advantages and disadvantages in terms of their technical aspects, their estimated energy and/or technological costs, the recovery efficiency of the targeted products, and the possibility of the utilization of bittern to aim for both minimal and zero liquid discharge targets. Of the bittern recovery technologies evaluated, electrodialysis offers efficient and highly selective separation of ionic compounds, while evaporation and precipitation are the most efficient methods of obtaining solid salt products (MgCl2, NaCl, KCl, etc.). In a minimal liquid discharge system, electrodialysis can be coupled with a thermal process or precipitation to achieve a less concentrated bittern effluent for safe disposal. However, in a zero liquid discharge process, more complex recovery technologies are applied, before the utilization of liquid bittern as a CO2 absorbent, cooling agent, or coagulant. Finally, we highlight areas of future research regarding technological developments that aim to enhance the effectiveness at larger scales and to improve the sustainability of bittern recovery and utilization. GRAPHICAL ABSTRACT
{"title":"Resource recovery and utilization of bittern wastewater from salt production: a review of recovery technologies and their potential applications","authors":"A. Bagastyo, Afrah Zhafirah Sinatria, A. Anggrainy, Komala Affiyanti Affandi, Sucahyaning Wahyu Trihasti Kartika, E. Nurhayati","doi":"10.1080/21622515.2021.1995786","DOIUrl":"https://doi.org/10.1080/21622515.2021.1995786","url":null,"abstract":"ABSTRACT In addition to high-purity salts, salt farms and industries generate a substantial amount of highly concentrated brine (bittern) byproducts. The presence of high salinity in this waste stream may lead to adverse environmental impacts. Environmental concerns and strict regulations on its disposal have driven the development of innovative practices for bittern management to achieve sustainable resource use and recovery. Meanwhile, commercial materials (Li, Rb, and Cs) that may be contained in the bittern can be seen as attractive value-added resources. This review article comparatively discusses the available technologies for bittern recovery, their advantages and disadvantages in terms of their technical aspects, their estimated energy and/or technological costs, the recovery efficiency of the targeted products, and the possibility of the utilization of bittern to aim for both minimal and zero liquid discharge targets. Of the bittern recovery technologies evaluated, electrodialysis offers efficient and highly selective separation of ionic compounds, while evaporation and precipitation are the most efficient methods of obtaining solid salt products (MgCl2, NaCl, KCl, etc.). In a minimal liquid discharge system, electrodialysis can be coupled with a thermal process or precipitation to achieve a less concentrated bittern effluent for safe disposal. However, in a zero liquid discharge process, more complex recovery technologies are applied, before the utilization of liquid bittern as a CO2 absorbent, cooling agent, or coagulant. Finally, we highlight areas of future research regarding technological developments that aim to enhance the effectiveness at larger scales and to improve the sustainability of bittern recovery and utilization. GRAPHICAL ABSTRACT","PeriodicalId":37266,"journal":{"name":"Environmental Technology Reviews","volume":"10 1","pages":"295 - 322"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47215862","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.1080/21622515.2021.1989059
M. Aryal
ABSTRACT Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous environmental contaminants that are considered toxic, carcinogens, and mutagens. One of the major concerns of environmental problems is the presence of PAHs due to the various natural and anthropogenic activities. The presence of PAHs in the environment creates problems since their presence has a detrimental effect on living beings. Biodegradation of PAHs is an environmentally friendly remediation technique involved in the removal of contaminants from the environment, which can be green and cost-effective, but it is far limited because of their low bioavailability. The presence of surfactants can increase the bioavailability of PAHs in aqueous solutions by lowering both surface tension and interfacial tension simultaneously. The sources and toxicity of PAHs, surfactant-enhanced solubilization of PAHs, inherent bacterial degradation of PAHs, the impact of synthetic and biosurfactant at the PAHs biodegradation, and possible mechanism of bacterial degradation in micellar solutions are presented in this review. GRAPHICAL ABSTRACT
{"title":"Performance and potential of bacterial biodegradation of polycyclic aromatic hydrocarbons from micellar solutions","authors":"M. Aryal","doi":"10.1080/21622515.2021.1989059","DOIUrl":"https://doi.org/10.1080/21622515.2021.1989059","url":null,"abstract":"ABSTRACT Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous environmental contaminants that are considered toxic, carcinogens, and mutagens. One of the major concerns of environmental problems is the presence of PAHs due to the various natural and anthropogenic activities. The presence of PAHs in the environment creates problems since their presence has a detrimental effect on living beings. Biodegradation of PAHs is an environmentally friendly remediation technique involved in the removal of contaminants from the environment, which can be green and cost-effective, but it is far limited because of their low bioavailability. The presence of surfactants can increase the bioavailability of PAHs in aqueous solutions by lowering both surface tension and interfacial tension simultaneously. The sources and toxicity of PAHs, surfactant-enhanced solubilization of PAHs, inherent bacterial degradation of PAHs, the impact of synthetic and biosurfactant at the PAHs biodegradation, and possible mechanism of bacterial degradation in micellar solutions are presented in this review. GRAPHICAL ABSTRACT","PeriodicalId":37266,"journal":{"name":"Environmental Technology Reviews","volume":"10 1","pages":"342 - 365"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45597389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.1080/21622515.2021.1986576
H. Kristianto
ABSTRACT Utilisation of natural coagulants in water and wastewater treatment has gained a considerable amount of interest in recent years. This is possible due to its advantages such as being renewable, being affordable at a relatively low cost, producing biodegradable sludge with less sludge generation. However, there are some drawbacks in the utilisation of natural coagulant, namely its long settling time and increase of organic content when a crude plant extract is used. To surmount these obstacles, a combination of magnetic iron oxide nanoparticle (IONP) with natural coagulant (i.e. magnetic natural coagulant) is introduced to enhance the coagulation performance. The purpose of this review is to provide extensive discussions on the recent progress of magnetic natural coagulant, especially over the last ten years. Most of the recent studies used protein extract from legumes as an active coagulating agent in the magnetic natural coagulant preparation with two different approaches. The dispersion approach used crude extract functionalised with IONP, while the adsorption approach immobilised protein on the surface of unmodified or modified IONP. In both approaches, protein acts as an active coagulating agent with a charge neutralisation mechanism. Due to the presence of IONP, the settling time is greatly reduced under the presence of external magnetic force, typically from 60–90 min to 5–30 min, while maintaining a good coagulation performance in various types of water – wastewater. Future studies of other coagulant preparation methods, applications to other active coagulating agents, and efforts to increase the coagulation efficiency are needed prior to its pilot – commercial scale application. GRAPHICAL ABSTRACT
{"title":"Recent advances on magnetic natural coagulant: a mini review","authors":"H. Kristianto","doi":"10.1080/21622515.2021.1986576","DOIUrl":"https://doi.org/10.1080/21622515.2021.1986576","url":null,"abstract":"ABSTRACT\u0000 Utilisation of natural coagulants in water and wastewater treatment has gained a considerable amount of interest in recent years. This is possible due to its advantages such as being renewable, being affordable at a relatively low cost, producing biodegradable sludge with less sludge generation. However, there are some drawbacks in the utilisation of natural coagulant, namely its long settling time and increase of organic content when a crude plant extract is used. To surmount these obstacles, a combination of magnetic iron oxide nanoparticle (IONP) with natural coagulant (i.e. magnetic natural coagulant) is introduced to enhance the coagulation performance. The purpose of this review is to provide extensive discussions on the recent progress of magnetic natural coagulant, especially over the last ten years. Most of the recent studies used protein extract from legumes as an active coagulating agent in the magnetic natural coagulant preparation with two different approaches. The dispersion approach used crude extract functionalised with IONP, while the adsorption approach immobilised protein on the surface of unmodified or modified IONP. In both approaches, protein acts as an active coagulating agent with a charge neutralisation mechanism. Due to the presence of IONP, the settling time is greatly reduced under the presence of external magnetic force, typically from 60–90 min to 5–30 min, while maintaining a good coagulation performance in various types of water – wastewater. Future studies of other coagulant preparation methods, applications to other active coagulating agents, and efforts to increase the coagulation efficiency are needed prior to its pilot – commercial scale application. GRAPHICAL ABSTRACT","PeriodicalId":37266,"journal":{"name":"Environmental Technology Reviews","volume":"10 1","pages":"255 - 270"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44943576","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.1080/21622515.2021.1982023
F. Campo, Camilla Tua, L. Biganzoli, S. Pantini, M. Grosso
ABSTRACT Lime is a product derived from the thermal decomposition of limestone (mainly calcium carbonate, CaCO3) into quicklime (CaO) and carbon dioxide (CO2), also called calcination. Controlled reaction with water is used to manufacture hydrated lime (Ca(OH)2) products. Lime is used in a wide variety of applications: metals industry, construction materials sector, civil engineering, environmental protection, agriculture, and chemical industry. Lime production is one of the sources of anthropogenic CO2 emissions resulting in global warming and ocean acidification. However, a proportion of the CO2 emitted during the calcination is reabsorbed by the lime during the product life within its different applications. This process called carbonation is thermodynamically favoured because it is exothermal. It allows permanent CO2 storage in a stable product since the lime combines with gaseous CO2 reforming CaCO3. This paper reports a comprehensive literature review on the carbonation potential of lime in different applications. The total carbonation potential is assessed as carbonation rate, i.e. the ratio between the CO2 reabsorbed through carbonation during the operational life of lime and the CO2 emitted during limestone calcination. This study provided preliminary evidence that, based on the current EU market, on average 23–33% of lime process emissions are carbonated during the use phase. Carbonation over time is also analysed for the lime applications where information is available. For three applications, namely water, flue gas cleaning and pulp and paper, the carbonation reaction is instantaneous. Up to 22% of the calcination emissions are absorbed within five years based on the current EU market. GRAPHICAL ABSTRACT
{"title":"Natural and enhanced carbonation of lime in its different applications: a review","authors":"F. Campo, Camilla Tua, L. Biganzoli, S. Pantini, M. Grosso","doi":"10.1080/21622515.2021.1982023","DOIUrl":"https://doi.org/10.1080/21622515.2021.1982023","url":null,"abstract":"ABSTRACT Lime is a product derived from the thermal decomposition of limestone (mainly calcium carbonate, CaCO3) into quicklime (CaO) and carbon dioxide (CO2), also called calcination. Controlled reaction with water is used to manufacture hydrated lime (Ca(OH)2) products. Lime is used in a wide variety of applications: metals industry, construction materials sector, civil engineering, environmental protection, agriculture, and chemical industry. Lime production is one of the sources of anthropogenic CO2 emissions resulting in global warming and ocean acidification. However, a proportion of the CO2 emitted during the calcination is reabsorbed by the lime during the product life within its different applications. This process called carbonation is thermodynamically favoured because it is exothermal. It allows permanent CO2 storage in a stable product since the lime combines with gaseous CO2 reforming CaCO3. This paper reports a comprehensive literature review on the carbonation potential of lime in different applications. The total carbonation potential is assessed as carbonation rate, i.e. the ratio between the CO2 reabsorbed through carbonation during the operational life of lime and the CO2 emitted during limestone calcination. This study provided preliminary evidence that, based on the current EU market, on average 23–33% of lime process emissions are carbonated during the use phase. Carbonation over time is also analysed for the lime applications where information is available. For three applications, namely water, flue gas cleaning and pulp and paper, the carbonation reaction is instantaneous. Up to 22% of the calcination emissions are absorbed within five years based on the current EU market. GRAPHICAL ABSTRACT","PeriodicalId":37266,"journal":{"name":"Environmental Technology Reviews","volume":"10 1","pages":"224 - 237"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43706200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.1080/21622515.2020.1869322
A. Sintakindi, B. Ankamwar
ABSTRACT Water bodies polluted with toxic dyes have been treated using various separation techniques. Biosorption as a process of adsorption onto biological materials including living and dead is of more consideration recently for pollutant removal. Fungal biosorbents have a great potential in dye removal due to varied functional groups, eco-friendly, cost-effective nature and a continuously used for application from food and industrial fermentation operations. This article discusses the health risk caused by dyes, presents the biosorptive ability of various fungi in dye removal from aqueous solution, reviews the different physico-chemical factors influencing adsorption, kinetic and equilibrium adsorption data and possible mechanisms in the adsorption process. GRAPHICAL ABSTRACT
{"title":"Fungal biosorption as an alternative for the treatment of dyes in waste waters: a review","authors":"A. Sintakindi, B. Ankamwar","doi":"10.1080/21622515.2020.1869322","DOIUrl":"https://doi.org/10.1080/21622515.2020.1869322","url":null,"abstract":"ABSTRACT Water bodies polluted with toxic dyes have been treated using various separation techniques. Biosorption as a process of adsorption onto biological materials including living and dead is of more consideration recently for pollutant removal. Fungal biosorbents have a great potential in dye removal due to varied functional groups, eco-friendly, cost-effective nature and a continuously used for application from food and industrial fermentation operations. This article discusses the health risk caused by dyes, presents the biosorptive ability of various fungi in dye removal from aqueous solution, reviews the different physico-chemical factors influencing adsorption, kinetic and equilibrium adsorption data and possible mechanisms in the adsorption process. GRAPHICAL ABSTRACT","PeriodicalId":37266,"journal":{"name":"Environmental Technology Reviews","volume":"10 1","pages":"26 - 43"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/21622515.2020.1869322","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44877710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.1080/21622515.2021.1893831
A. K. Saim, P. Adu, R. Amankwah, Millicent Nkrumah Oppong, Francis Kwaku Darteh, Abdul Wasiu Mamudu
ABSTRACT Biologically synthesized metallic nanoparticles for catalytic activities in wastewater treatment applications is regarded as a safer alternative to usual physical and chemical methods due to their cost-effectiveness, environmental friendliness and easy handling. Recently, research into nanotechnological applications of catalytic and wastewater treatment processes has increased exponentially because of its numerous benefits. This work reviews and summarizes several articles published from 2014 till now concerning biosynthesized nanoparticles and their applications in treating pollutants from wastewater. This review shows that biosynthesized nanoparticles using plant, algae and fungi, microorganisms, enzymes and other biomaterials and polymers have been efficient in removing heavy metals, pathogenic bacteria and organic pollutants, such as dyes, from synthetic wastewaters. This review looks in further detail at significant contributions of biosynthesized nanoparticles in treating pollutants from real wastewater samples, establishing their potency in large-scale real wastewater treatment plants. Comparatively, it is demonstrated that biosynthesized nanoparticles are very promising candidates to treat various contaminants found in wastewater than chemically synthesized nanoparticles, due to smaller sizes in general, good stability, high surface area charge and better photoluminescence emission properties of biosynthesized nanoparticles. Further discussed are the future opportunities of these biosynthesized nanoparticles in contaminant removal. Overall, this review aims to project a rapid developmental path showing a broad overview of recent nanobiotechnologies, applications, and prospects for researchers in nanotechnological fields in wastewater treatment. GRAPHICAL ABSTRACT
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